In epidemiological studies there is a reverse correlation between HDLc and cardiovascular events but after drug intervention, what the implication is of a change in HDLc is hard to say.
流行病学研究显示HDL - C水平和心血管事件间呈负相关，但药物干预后hdl - C水平的变化有何意义还不明确。
In reliable protocols such as TCP and HDLC, a timer is required to timing for data package overtime retransmission.
在TCP、HDLC等能提供可靠通信服务的通信协议中，需要使用定时器来对数据包的超时重发进行计时。
The HDLC Protocol Controller can be used as a D-channel interface in a digital line card comprised of multiple DNICs.
HDLC协议控制芯片也可以作为D通道接口，用在包含多个DNIC的数字线路卡上；
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